Beam



FIG. 1 is a perspective view of a beam showing our new design;

FIG. 2 is a perspective view of a second embodiment of a beam showingour new design;

FIG. 3 is a perspective view of a third embodiment of a beam showing ournew design;

FIG. 4 is a perspective view of a fourth embodiment of a beam showingour new design; and

FIG. 5 is a perspective view of a fifth embodiment of a beam showing ournew design.

The ornamental design for a beam, as shown and described.